Professor Marsden is a chemistry teacher at Hillside High School.
He is a Caucasian malewith brown hair. He wears a light blue lab coat with a light brown shirt underneath and a brown tie.
He's very strict about teaching, that he disapproved of the students having any fun, thinking they should do schoolwork.
The New Scooby and Scrappy Doo Show
He saw Daphne and Scrappy in the computer lab, and without Daphne explaining, takes the video game that was dropped by the creature, and ordered them to leave.
He showed up when Toby Wallace was caught, and lectured him saying he'd better find a way to pay all the damages he caused.
At the dance he was disturbed about Scooby's new dance he made up.